Np
Neptunium
93
Atomic Number: 93
Atomic mass: [237]
Ionization energy: 605
Electronaffinity:
Covalent radius:
Calculated radius:
Empirical radius: 175
Vanderwaals radius:
Electronegativity: 1.36
Density: 20.45
Oxidation states: 3, 4, 5, 6, 7
Melting point: 917
Boiling point: 4273
Electron configuration: [Rn] 5f4 6d1 7s2
Element group: 8
Element period: 9

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